Asphalt-cutting tool



Apr. 17, 1923. 1,452,037-

w. J. ,GLEASNER ASPHALT CUT'I ING TOOL Filed sent. 15 1920 INVEN TOR.

I ikmz kw ATTORNEY.

Patented Apr. 17, 1923.

UNITED sures WILLIAM J. GLEASNER, OF KENMORE, NEW YORK.

| ASPHALT-CUTTING TOOL.

Application filed Septemlier 15, 1920. Serial No. 410,536.

To all whom it may concern Be it known that I, WILLIAM J. GLEASNER, a citizen of the United States, residing at Kenmore, in the .county of Erie and State of New York, have invented certain new and useful Improvements in Asphalt-Cutting Tools, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to an improved asphalt cutting .tool, and an objectis to provide a cutter especially adapted for use in connection with pneumatic hammers for the purpose of operating on asphalt, whereby parts of the asphalt may be cut and then subsequently removed.

Another object is to provide means for limiting the insertion of the tool into the barrel of the pneumatic hammer.

Still another object is the provision of means cooperating with the limiting means for preventing detachment of the cutting. tool from the barrel.

A further'object'embodies means consisting of a depth guide to prevent the cutter from entering the asphalt more than any given depth.

A still further object embodies means consisting of a collar for holding the depth guide to the casing of the pneumatic hammer, and for holding the means for preventing the detachment of the cutter to the casing of the pneumatic hammer.

Additionally, the inventionaims to provide means to be engaged by the foot of the operator for forcing the cutter into the asphalt, especially on cold days and at times when the asphalt is extremely hard.

While the design and construction at present illustrated and set forth is deemed preferable, it is obvious that as a result of a reduction of the invention to a more practical form for commercial purposes, the invention may be susceptible to changes, and the right to these changes is claimed, provided they are comprehended within the scope of what is claimed.

' The invention comprises further features and combination of parts as will be. herein-- after set forth, shown in the drawings and claimed.

In the drawings:

Figure l is a view of a conventional form of pneumatic hammer, showing the improved cutter-as applied, also illustrating the depth gauge, and also the means for holding the cutter in engagement with the pneumatic hammer;

Figure 2 is an enlarged detail view of the lower part of the pneumatic hammer showing the cutter engaging the barrel of the pneumatic hammer in dotted lines;

Figure 3 is a detail perspective view of the cutter;

Figure 4c is a detail view of the depth gauge; and

1Figure 5 is a detail view on line 55 of F lgure 2 showing the depth gauge and the cutter holding means on the casing of the hammer.

Referring to the drawings, 1 designates the casing of a conventional form of pneumatic hammer, and 2 denotes a-cutting tool constructed from special bar steel and which may be of any suitable dimensions. The tool is provided with a shank 3 to enter the barrel of the pneumatic hammer. The shank 3 at its base portion becomes larger, acting to limit the insertion of the tool into the barrel of the hammer. In other words, a collar is formed at the baseof the shank and beyond the collar the cutting tool merges into a flat blade 4, the opposite edges of which are inclined toward the collar 5.

The blade 4 is provided with a. sharp cut ting edge, which is slightly curved with the length of the cutting edge in order to more readily enter the asphalt when the pneumatic hammer is in operation. It. will be noted that the rapid successive hammer blows delivered to the pneumatic hammer cause the cutting edge to enter the asphalt. The pneumatic hammer may then be raised and the cutting tool replaced and the asphalt subsequently cut. These operations are consecutively repeated until a substantial portion of the asphalt is cut, and the severed piece may be afterwards removed. In order to lift the patch or the cut portion of the asphalt, the fiat cutting-blade may be inserted in the cuts and the cut asp-halt. may be lifted or, pried from its position and then broken or shaken up.

In order to prevent the cutting tool from detaching from the barrel of the vpneumatic hammer,a suitable holder 6 is provided. This holder comprises a shank 7 which'is semi-circular in cross sectionand is adapted to'fit theexterior surface of the casing of the hammer, as shown clearly in Figures land 2. The lowerapartof the til) and terminates in a curved spring arm 8, the terminal 9 of which engages one face of the flat blade of the cutter at a point immediately below the collar 5, thereby preventing downward movement of the cutter. In other words, by means of the terminal 9 engaging the under part of the collar and the collar acting to limit the insertion of the tool into the barrel of the hammer, maintains the cutting tool in firm position and against movement.

In order to maintain the holder in position, a suitable clamp collar 10 is provided. This collar 10 engages around the casing of the pneumatic hammer and is elliptical in cross section so as to permit of the insertion of the shank 7 of the holder, there being diametrically opposite set screws 11 to not only hold the collar in position. but also to hold the shank 7 and the shank 12 of the depth'guide in place. The depth guide is similar in construction to the holder, with the exception that the depth guide 13 is longer and has its terminal 14 of its curved arm 15 engaging the opposite face of the flat blade of the cutting tool at a point very close to the cutting edge of the tool. It is obvious that the depth guide may be adjusted so as to govern the depth of the cut when the depth guide is in position, and

it prevents the cutting tool from entering the asphalt more than any given depth. The shank of the depth guide is also semi-circular in cross section to conform to the contour of the casing of the pneumatic hammer.

The clamping collar is provided with additional diametrically opposite set screws 16, which engage through the collar at diametrically opposite points at right angles to the set screws 11. These set screws 16 engage the casing of the hammer, thereby holding the collar securely in place against vertical movement as well as against lateral movement.

A suitable foot piece 17 is provided and is carried by the collar owing to any one of its openings 18 being engaged by one of the set screws 16. It is obvious that the foot piece may be adjusted relatively to the collar. A look nut 19 is carried by the set screw carrying the foot piece so as to secure the foot piece in position. The lower end of the foot piece terminates in a right angle foot engaging portion proper 20, upon which the foot of the operator may engage for applying pressure on the pneumatic hammer and forcing the cutter into the asphalt, concrete or the like.

The cutting tool holder 6 is designed to be constructed of a piece of especially tempered steel, hand forged, so as to fit the pneumatic hammer barrel. As previously stated, the holder secures the cutter in position and prevents-the cutter from turning relatively to the hammer.

The cutting tool or blade is also hand forged from special bar steel, and especially tempered for this class of work. The shank of the cutter is turned to fit the bore of the pneumatic hammer. The shank may be any suitable length or diameter.

The collar which secures the holder and the depth guide in position is designed to be made of cast steel, and owing to its oval or elliptical shape, it affords means to permit of the insertion of the depth gauge and holder between the wall of the collar and the cylindrical surface of the barrel of the hammer.

The foot engaging piece is designed to be constructed of flat heavy iron, which may be made of any thickness or length, and as previously stated, it is capable of adjustment relatively to the collar.

The foot piece is especially adapted for tall operators in order to facilitate applying pressure upon the pneumatic hammer. For instance, in the morning, late afternoon, and on cold days, the asphalt is hard, and, therefore, it is more difficult to cut the asphalt at such times. When using the foot piece, the operator can lforce the cutter into the asphalt and cut the same as easy as when the asphalt is soft and warm.

The invention having been set forth, what is claimed as new and useful is 1. In a pneumatic asphalt cutter, a pneumatic hammer, a cutter at a point below the barrel engaging the barrel of the hammer, means carried by the casing of the hammer to prevent the cutter from entering the asphalt more than a given depth, means for retaining the cutter in the barrel, means carried by the cutter and cooperating with the barrel to limit the insertion of the cutter in the barrel, and means carried by the barrel and extending below the barrel overlying said limiting means to prevent detachment of the cutter.

2. In a pneumatic asphalt cutter, a pneumatic hammer, a cutting tool having an enlargement at a point between its ends and having a shank engaging the barrel of the hammer, the enlargement cooperating with the barrel to limit the insertion of the shank thereinto, means cooperating with the enlargement to retain the shank in the barrel, a foot engaging piece to receive foot pressure to force the cutter into the asphalt. and a clamp mounted on the casing of the hammer and provided with means to removably support the foot piece in parallelism with the hammer.

3. In a pneumatic asphalt cutter, a pneumatic hammer, a cutting tool engaging the barrel of the hammer, means to limit the insertion of the cutting tool into the asphalt to a given depth, said tool having a shoulder at a point below the barrel, means adjacent the barrel and overlying and engaging said shoulder for retaining the tool in the barrel, and a clamp surrounding the casing of the hammer and the depth and retaining means for holding both of said means in position, and means {or retaining the clamp in place.

4. In a pneumatic asphalt cutter, a pneumatic hammer, a cutting tool engaging the barrel of the hammer, means to limit the insertion of the cutting tool into the asphalt to a given depth, means for retaining the tool in the barrel, a clamp surrounding the casing of the hammer and the depth and retaining means for holding both of said means in position, means for retaining the clamp in place, a foot engaging piece to receive foot pressure for forcing the tool into the asphalt, and means carried by the clamp for removably supporting the foot piece.

5. In a pneumatic asphalt cutter, a pneumatic hammer, a cutting tool having a shank engaging the barrel of the hammer, said tool having an enlargement cooperating with the barrel to limit its insertion thereinto, a tool retaining member lying adjacent the casing of the hammer and overlying the tool and cooperating with the enlargement to retain the tapered shank of the tool in the barrel of the hammer, a depth gauge lying adjacent the casing of the hammer and having a portion overlying the cutting tool to limit the tool in its cutting action to a given depth, a clamp surrounding the casing of the hammer and the retaining, means and depth gauge and provided with means for engaging and holding the depth gauge and the limiting means in place.

6. In a pneumatic asphalt cutter, a pneumatic hammer, a, cutting tool having a shank engaging the barrel of the hammer, an enlargement formed at the base of the shank and cooperating with the barrel tolimit the insertion of the shank thereinto, a tool retaining member lying adjacent the casing of the hammer and overlying the tool and cooperating with the enlargement to retain the tapered shank of the tool in the barrel of the hammer, a depth gauge lying adjacent the casing of the hammer and having a portion overlying the cutting tool to limit the tool in its cutting action to a given depth, a

clamp surrounding the casing of the hammer and the retaining means-and depth gauge and provided with means for engaging and holding the depth gauge and the limiting means in place, diametrically opposite means carried by the clamp and engaging the easing ot the hammer to retain the clamp in place, a foot engaging piece on which foot pressure may be applied for forcing the cuting tool into the asphalt, said foot engaging piece being adjustably engaged with one of the diametrically opposite holding means for the clamp, and means for tightening the foot piece in place- 7. The combination with a pneumatic percussion device including a barrel, of a cutting tool engaging said barrel and provided with a shoulder at a. point below the end of the barrel and engaging said end to limit the insertion of the tool in the barrel, a tool retainer comprising a plate detachably connected to the side of the barrel and provided with a curved spring portion extending below the lower end of the barrel overlying and engaging said shoulder to prevent de tachment of the cutter.

8. The combination with a pneumatic percussion device including a barrel, of a cutting tool engaging the end of the barrel and provided with a shoulder at a point immediately below said end to limit the tool in its insertion into the barrel, a tool holder. comprising a plate engaging the side of the barrel and having a spring portion extending below said end overlying and engaging said shoulder to retain the tool in the barrel, a depth gauge comprising a plate engaging the side of the barrel and having a curved spring portion extending below the end of said barrel and terminating a short distance above the cutting edge of the tool, where the terminal of the spring portion of the depth gauge engages, thereby preventing the cutter from entering the asphalt more than the given depth, a clamp collar surrounding the barrel and having means to engage both of said plates to hold them in place, and means for securing the collar adjustably in position.

9. An article of manufacture, comprising a cutting tool having a shoulder to limit its insertion into the barrel of a pneumatic hammer, a tool retainer comprising a plate to engage the side of the barrel of said hammer and extend below the lower end of the barrel and overlie and engage said shoulder to retain the tool in position, a collar adapted for engaging around the barrel and provided with means for holding the plate detachably connected with the side of the barrel, and means passing through the collar and adapted to engage the barrel to hold the collar in position.

In testimony whereof I hereunto aflix my signature.

WILLIAM J. GLEASNER. 

